Furnace



Oct. 13, 1925.

C. L. LEE ET AL FURNACE Filed Feb. 11, 1924 2 Sheets-Sheet 2 Juarez-220215 4114; .3 x, 244

Patented Get. 13, 1925.

UNITED STATES PATENT OFFICE.

CHARLES L. LEE AND HOMAS C. VAN DEGRIFT, F DAYTON, OHIO, A'SSIGNORS TO GEN- ERAL MOTORS EARCH. CORPORATION, OF DAYTON, OHIO, A CORPORATION OF DELAWARE.

FURNACE.

Application filed February 11, 1924. Serial No. 691,928.

To all whom it may concern:

Be it known that we, CHARLES L. LEE and THOMAS C. VAN.DEGRIFT, both citizens of the United States of America, residing at Dayton, county of Montgomery, and State of Ohio, have invented certain new and useful Improvements in Furnaces, of which the following is a full, clear, and exact description.

This invention relates to apparatus for treating bodies which are introduced into and removed from a' furnace heating chamber while the heating of the chamber is continued.

One of theobjects of the invention is to minimize the loss of heat from the furnace when the furnace door is opened to permit removal of articles from the furnace or to introduce other articles to be heated.

A furtherobject is to protect the operator from excessive heat when the furnace door is opened. 1

Another object is to facilitate removal of articles from the furnace and the placing therein of other articles to be heated.

Further objects and advantages of the present invention will be apparent from thefollowing description, reference being had to the accompanying drawings, wherein a 30 preferred embodiment of one form of the present invention is clearly shown.

In the drawings:

Fig. l is a sectional View of a furnace embodying the present invention the furnace door being open and the article supporting spindles being in forward position to permitplacing thereon the work to be heated.

Fig. 2 is a sectional view of the mechanism for moving the carriage which supports the work spindles.

Fig. 3is a sectional View ofthe furnace with the door closed and the spindles retracted to work heating position.

Fig. 4 is a mechanical diagram showing the manner of driving the spindles by one The vestibule is closed by a door 28 attached to a cable 29 leading over pulleys 30 and connected with an eccentric pulley 31 mounted on a shaft 32 supported below tracks .33 (one shown) mounted on legs 34 and 35 at the rear of furnace 20.

.Tracks 33support a carriage mounted 1 on wheels .41.. Carriage 40, supports bearing brackets 42 and 43 which support four shafts 44, 45, 46, and 47. Each shaft supports a spindle 48 of heat resistingmaterial which extends through a tube 49 in the furnace wall, and is in alinement with one of the openings 24 in partition 23. Each spindle 48 is detachable from its shaft and it is driven through a pin-and-bayonet-slot 62 connected with a piston 63 reciprocable in a cylinder 64 supported between the tracks 33. The ends of cylinder 64 are connected by pipes 65 and 66 with a valve body 67 carrying a rotatable valve 68 having two separate passages 69 and 70. Valve body 67 is provided with an exhaust port 71 and is connected with a fluid pressure (such as air) supply by a pipe 72. Valve 68 is mounted on a spindle '7 3 carrying a gear 74 which meshes with a gear 75 located on shaft 76 which extends through a tube '77 in furnace-20 and terminates in a pedal 78. 1

At 80, thebracket 61 is attached to a cable 81 connected with a pulley 82 on shaft 32. 1

The walls of the chamber 21 of .the fur- 4 nace support electrical heating coils 90 by which the chamber 21 is heated.

To operate the furnace, the treadle 78 is moved so that air will be admitted to the 7 left end (as viewed in Fig. 2) ofthe cylinder 64 to cause the carriage 41 to be moved to the spindle loading. and unloading positions as shown in Fig. 1. The movement of e the spindles 48 to this position causes the door 28 to be lifted from the furnace open tween pulley 3L and door 28. As the carriages-0 moves-to-the right, as viewed in Fig. 1, the cable 81 will pull the pulley 82 ina clockwise direction. The pulley 31, moving 3 from, the position shown in Fig 3, to that shown in Fig. 1 will wind up the cable 29 and thus elevate the door.

Each of the work spindles i8 project through an opening 2.4 into the; loading vestibule 22. The work, such as an iron cylinder 100 to which copper finslOl are to be brazed by a process disclosed in thGnCO- pending application of Charlesv F; Kettering, Serial No. 51%,014, filed November 9,

1 i921 (case'fi), isimountedl on a. spindle 48,

the Opening Qet being-large enough to receive the-work The cylinder may-be provided witha flange 102: It; is: apparent that thefins-l0l and. the flange 1021 as well as 'the' spindle 458 and cylinder 100- will materially be located: aszshown in Fig; 2, to admit fluid pressure-to the right hand end of cylinder 64, whereupon the carriage 40 Will be moved to the work heating position shown in Fig. and the furnace door 28 will be moved to close the'furnace opening.

The spindles may be rotated when desiredby operatingtheelectric motor 60, regard less of the'position of the carriage In the process: disclosed in the application referred "to, it is desirable to rotate the work whilebelng heated 111' order to secure even heatdistribution and to prevent segregation of thebonding material used tojoin the copper fins to the iron-cylinderwall After the bonding-temperature is: reached, the carriage ismoved to thepositionshown in Fig: 1, while the spindles 48 are still rotating, The cylinders cool while being rotated to a temperature below the-:meltingpoint of the bonding material, so that even distribution-- of the-bonding material is obtained.

The-cylinder 10O therefore acts as a dooror bafiie tending to prevent the escape of heat from the chamber 21 through one of the openings 24 in the-1: artition*-23, at thetime thedoor 28 is elevated. Therefore the escape of' heat is minimized and the furnace operator-may attend the furnace with lessdiscomfort. Since the carriage moves the spindles48*--to work heatingposition the operator is required te approach the fur naceopeni ng i only sufiiciently to remove work from or to placework upon the ends of thespindlesawhen. they are located" in: thevestibule 22=as shown inwFig; 1.

While: the form of: embodiment of the Withinthescope ofthe claimsnwhichf'ollow;

Whatiis claimed is as follows:

11. Heat treating apparatus comprising in combination, a furnace including a heating chamber; a vestibule separated from the heating chamber by an aperturedpartition a door for the vestibule; and: commonnmeans for moving work pieces from the heating chamber into the vestibule and opening the door of the vestibule;

2. Heat treating apparatus comprising in combination a furnace including a heating chamber; a vestibule separated from the heatingchamber by. an apertured partition; a door for thevestibule; means for moving treated work pieces from. the heating chanr berintothe vestibule and. work pieces to be treated fromthe.vestibule into the heating chamber; and: means associated with. the

workpiece-moving means for opening and.

closing; the vestibule door when the work pieces are moved into the vestibule and: heating chamber respectively.

Heattreating apparatus comprising in combination, a furnace including a heating chamber; a vestibule separated from the heating chamber byan apertured partition; a carriage having two positions; work-piecesupporting spindles rotatably carried by the carriage, and extending through one. wall; of the heating chamber so that their free ends are i111 theheating chamber when the carriage is in its retracted position; means on the carriage for rotatingt-he spindles; and meansfor: moving the carriage into its forward position whereby thezspindle ends will be moved from the heating chamber through the apertured partition into the vestibule,

the mainbody of thewspindlesextending throughzthe heating chamber while in this position.

4. Heattreatin'g apparatus comprising in combination, a furnace including a heating chamber; a-vestibule separated from the heating chamber by an 'apertured partition;

a door=for said vestibule; a carriage having retracted and forwardpositions; workpiece-carrying spindles rotatably supported th-ecarriage into its "forward position and simultaneously opening the vestibule door and forreturnin'gthe carriage-to its retracted position and closing the vestibule door.

5i Heat treating apparatus comprising in combination, a furnace including a heating chamber; awvestibule' separated: from the heating: climber by an apertured partition; a .door for thewvestibule; and inc-ans for simultaneously'opening the. door and moving the work. pieces from the heating. chamber into "the vestibule and holding said Work pieces in such a position in the vestibule so that they Will act as a battle to prevent escape of heat from the heating chamber While the vestibule door is held open.

6. Heat treating apparatus comprising in combination, a heating chamber provided with an opening; a door for said opening; a Work carrier located Within the heating chamber; means for moving the Work carrier toward the heating chamber opening and opening the door to permit removal of the treated Work and application of new Work to be treated and for retracting the Work carrier from the opening and closing the door.

7. Heat treating apparatus comprising in combination, a furnace having a heating chamber, a vestibule separated from the heating chamber by an apertured partition, and a door for the vestibule; and means for moving Work pieces through said apertured partition and for rotating said Work.

8. Heat treating apparatus comprising, in combination, a furnace having a heating chamber, a vestibule separated from the heating chamber by an apertured partition, and a door for the vestibule; and means for moving Work pieces through said apertured partition and for rotating said Work, and for operating said door.

In testimony whereof We hereto afiix our signatures.

CHARLES L. LEE. THOS. C. VAN DEGRIFT. 

